All?Inorganic Quantum?Dot LEDs Based on a Phase?Stabilized ??CsPbI ₃ Perovskite

The all-inorganic nature of CsPbI3 perovskites allows to enhance stability in perovskite devices. Research efforts have led improved the black phase films; however, these strategies-including strain and doping-are based on organic-ligand-capped perovskites, which prevent from forming close-packed quantum dot (QD) solids necessary achieve high charge thermal transport. We developed an inorganic ligand exchange that leads QD films with superior increased atomic-ligand-exchanged films, once mechanically coupled, exhibit stability, we link this distributing across film. Operando measurements temperature LEDs indicate KI-exchanged transport compared controls rely organic ligands. a maximum EQE 23 % electroluminescence emission centered at 640 nm (FWHM: ?31 nm). These red provide operating half-lifetime 10 h (luminance 200 cd m-2 ) is 6× higher than control